Technical information are provided for informative purpose only and can be subject to change without prior notice 196 Automotive Catalogue Actuation Z-Series ACTUATION Concept design of the brake The braking system is a patented mechanical device capable of operating in the absence of a pneumatic command and of holding the load statically in any position during the piston's stroke. The braking device includes a threaded shaft, with one end operatively coupled to the rod of the pneumatic cylinder, so that the rod's translation causes the threaded shaft to rotate. The second end of the shaft is provided with a head portion, designed to come into contact with the braking assembly, which consists of: a secondary piston, 8 springs, a cup-shaped element, a cage, rollers, and a braking pin (an illustrative image of the above-mentioned parts is shown alongside). Functioning principle of the brake The braking device is not able to rotate, it is locked against rotation but it is axially movable. The cup-shaped element retains the rollers within an internal housing with a plurality of locking seats which are like recesses in the inner wall of the housing, and they have a conical surface. The cage-shaped element acts as a support structure. The choice of using rollers aims at amplifying the contact surfaces during the braking. During the braking there are at least 3 points on each roller in touch with the groove of the cage. The receptables are designed in radial direction with a tapering in radial direction, too, which prevents the rollers from coming off their locking seats. The rollers are dragged into rotation with the cage by the head portion and for a very short angular stretch the rollers and the cage follow the rotation imparted thanks to the friction with the head portion until they reach a configuration in which the specific geometry of their seats in cooperation with the receptacles in the cage prevents any further displacement and they therefore engage in the other seat. Now the rollers are in their maximum radial protrusion towards the axis of the cylinder, therefore in their maximum engagement and friction with the head portion. The limited radial and angular clearance of the rollers prevent locking situations of the head portion inside the braking seat. DEACTIVATED CONDITION ACTIVATED CONDITION Patented Cup-shaped element Cage element Braking pin
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